Answer:
c
Explanation:
soil will stay cooler
Aluminum metal reacts with hydrochloric acid according to the following equation:
2 A l left parenthesis s right parenthesis plus 6 H C l left parenthesis a q right parenthesis rightwards arrow 2 A l C l subscript 3 left parenthesis a q right parenthesis plus 3 H subscript 2 left parenthesis g right parenthesis
If 28.1 grams of aluminum reacts with 46 mL of a 1 M HCl solution, how many grams of AlCl3 will be generated? Hint: You must determine the limiting reactant
Answer:
18 g
Explanation:
Step 1: Write the balanced equation
2 Al + 6 HCl ⇒ 2 AlCl₃ + 3 H₂
Step 2: Calculate the moles of Al
The molar mass of Al is 26.98 g/mol.
28.1 g × 1 mol/26.98 g = 1.04 mol
Step 3: Calculate the moles of HCl
46 mL of 1 M HCl react.
0.046 L × 1 mol/L = 0.046 mol
Step 4: Determine the limiting reactant
The theoretical molar ratio of Al to HCl is 2:6 = 0.33:1.
The real molar ratio of Al to HCl is 1.04:0.046 = 22.6:1
According to this, the limiting reactant is HCl.
Step 5: Calculate the mass of AlCl₃ generated from 0.046 moles of HCl
The molar ratio of HCl to AlCl₃ is 6:2. The molar mass of AlCl₃ is 133.34 g/mol.
0.046 mol HCl × 6 mol HCl/2 mol AlCl₃ × 133.34 g AlCl₃/1 mol AlCl₃ = 18 g AlCl₃
Please help I will give brainiest
Answer:
Answer
Answer is option B coz da negative charge r more thn positive
Answer:
B.
Explanation:
On the hand in the option B there are 3 positive and 5 negative signs so the answer is B.
Help for chem/physics
Answer:
first and 3rd are ur answers
Lying in bed you notice that you get cold every time your brother opens the door. This is most closely associated with which step in the scientific method?
Answer:
Making an observation100% sure about that....just believe me
Hope u the best and hope that helps
True or false?
An apple, potato, and onion all taste the same if you eat them with your nose plugged.
Answer:
Its true I think but I may be wrong lol
Answer:
An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged
Explanation:
y e s
Examples of solutions can be:
O A. a solid dissolved in a liquid
O B. gas mixed with a liquid
O C. liquid mixed with a liquid
OD. all of the the above
Answer:
B. gas mixed with a liquid
Explanation:
because:
A. a solid can't dissolve in a liquid.
C. two liquids mixed isn't a solution
D. Not All of the above for sure.
Examples of solutions can be all of the above. The correct option is D.
What is a solution?A solution is made when a solute is mixed with a solvent. The solution can be a liquid, solid, or gas. The solution is made when the solute is fully mixed with the solvent. The solute is the substance that gets mixed, and the solvent is the base in which the solute gets dissolved.
So, a solid dissolved in a liquid, gas mixed with a liquid, or a liquid mixed with a liquid, the energy statement is true for a solution.
Examples of a solution are sugar dissolved in water when water mix with soda and state gets mixed with water or another gas.
Thus, the correct options are D. all of the the above.
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visible light with a wavelength of 4.7x10^-7 meters will have a frequency of ....
The visible light with a wavelength of 4.7x10^-7 meters will have a frequency of 0.67 × 10¹⁵ Hz.
What do you mean by wavelength ?The term wavelength is defined as the distance between two successive crest and two successive trough. Wave length is represented by the symbol "λ" (lambda). The formula of wavelength is given by equation as follows:
λ = ν × f
So, the distance between either one crest or trough of one wave and the next wave is known as wavelength.
Wavelength relates to frequency as follows:
λ = ν × f
Where,
λ = Wavelength of light
ν = speed of light
f = frequency of light
We have
λ = 4.7x10^-7 meters
F = ?
ν = 3 × 10⁸ m/s
By substituting this values in given equation we get,
λ = ν × f
f = 3 × 10⁸ / 4.7x10^-7
f = 0.67 × 10¹⁵ Hz
Thus, visible light with a wavelength of 4.7x10^-7 meters will have a frequency of 0.67 × 10¹⁵ Hz.
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net ionic equation of HF(aq)+RbOH(aq)=H2O(l)+RbF(aq)
net ionic equation
H⁺(aq)+OH⁻(aq)⇒H₂O(l)
Further explanationThe electrolyte in the solution produces ions.
The equation of a chemical reaction can be expressed in the equation of the ions
For strong electrolytes (the ionization rate = 1) is written in the form of separate ions, while the weak electrolyte (degree of ionization <1) is still written as an un-ionized molecule
In the ion equation, there is a spectator ion that is the ion which does not react because it is present before and after the reaction
When these ions are removed, the ionic equation is called the net ionic equation
For gases and solids including water (H₂O) can be written as an ionized molecule
So only the dissolved compound is ionized ((expressed in symbol aq)
Reaction
HF(aq)+RbOH(aq)⇒H₂O(l)+RbF(aq)
ionic equation
H⁺(aq)+F⁻(aq)+Rb⁺(aq)+OH⁻(aq)⇒H₂O(l)+Rb⁺(aq)+F⁻(aq)
net ionic equation
H⁺(aq)+OH⁻(aq)⇒H₂O(l)
Which definition best describes the term activation energy?
a) the energy required to remove an electron from a gaseous atom
b) the minimum kinetic energy that particles must possess for a chemical reaction to occur
c) the energy of motion
d) the energy required to separate ions in a crystalline solid
Answer:
B
Explanation:
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what is the fractional distillation
Microwave ovens use microwaves with a wavelength of 0.12 meters. How much energy does this wave have? 2 x 10-20 10 mm FI
Answer:
E = 165.75×10⁻²⁶ J
Explanation:
Given data:
Wavelength = 0.12 m
Energy of wave = ?
Solution:
Formula:
E = h c/λ
c = 3×10⁸ m/s
h = 6.63×10⁻³⁴ Js
Now we will put the values in formula.
E = 6.63×10⁻³⁴ Js × 3×10⁸ m/s / 0.12 m
E = 19.89×10⁻²⁶ J.m / 0.12 m
E = 165.75×10⁻²⁶ J
In the reaction of aluminum metal and oxygen to make aluminum oxide, how many grams of oxygen gas will react with 2.2 moles aluminum metal?
Answer:
52.8 g of O2.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
4Al + 3O2 —> 2Al2O3
From the balanced equation above,
4 moles of Al reacted with 3 moles of O2 to produce 2 moles of Al2O3
Next, we shall determine the number of mole of O2 needed to react with 2.2 moles of Al. This can be obtained as follow:
From the balanced equation above,
4 moles of Al reacted with 3 moles of O2.
Therefore, 2.2 moles of Al will react with = (2.2 × 3)/4 = 1.65 moles of O2.
Thus, 1.65 moles of O2 is needed for the reaction.
Finally, we shall determine the mass of O2 needed as shown below:
Mole of O2 = 1.65 moles
Molar mass of O2 = 2 × 16= 32 g/mol
Mass of O2 =?
Mole = mass/Molar mass
1.65 = mass of O2 /32
Cross multiply
Mass of O2 = 1.65 × 32
Mass of O2 = 52.8 g
Therefore, 52.8 g of O2 is needed for the reaction.
The specific rotation of (S)-2- butanol is + 13.5. If 1.00 g is dissolved in 10.0 mL of ethanol and placed in a sample cell with a length of 1.00 dm, what observed rotation do you expect?
Answer:
-1.35 degree
Explanation:
Given the specific rotation of (S)-2-butanol = +13.5 degree
So, the specific rotation of its enantiomer (R)-2-butanol = -13.5 degree
Now the optical rotation of a pure liquid is given by
[tex]$\theta = [\alpha]_\lambda ^t.l.d$[/tex]
Here, [tex]$\theta$[/tex] = the optical rotation
[tex]$[\alpha]_\lambda^t$[/tex] = specific rotation at temperature 't' and wave length 'λ'
= -13.5 degree
l = optical path length
= 1 dm
d = density
= 1/10
Therefore,
[tex]$\theta = -13.5 \times 1 \times \frac{1}{10}$[/tex]
= -1.35 degree
What is the kinetic energy of a ball with a mass of 0.5 kg and a velocity of 10 m/s? (Formula:) 25 J 5 J 50 J 100 JWhat is the kinetic energy of a ball with a mass of 0.5 kg and a velocity of 10 m/s? (Formula:) 25 J 5 J 50 J 100 J
Answer:
25J
Explanation:
K.E = 1/2mv^2
= 1/2*0.5*10^2
= 25J
The kinetic energy of the ball is 25 J
What is kinetic energy?Kinetic energy can be defined as the energy possessed by an object in motion. Mathematically, it can be expressed as:
KE = ½mv²
How to determine the kinetic energyFrom the question given above, the following data were obtained:
Mass (m) = 0.5 KgVelocity (v) = 10 m/sKinetic energy (KE) =?KE = ½mv²
KE = ½ × 0.5 × 10²
KE = 0.25 × 100
KE = 25 J
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If a horse travels 20 meters in 5 seconds what is the horses speed
distance = speed * time
speed = distance / time
speed = 20 meters / 5 seconds
speed = 4 meters / second
hope this helped!
How many liters of blood does a human body have
Answer:
20000
Explanation:
In the lab you react 20g of potassium iodide with an excess of lead (II) nitrate to form 15g of lead (II) iodide precipitate. What is the percent yield of your experiment?
What is the balanced equation for this question?
What is the first ratio used to solve this question?
What is the second ratio used to solve this question?
What is the third ratio used to solve this question?
What is the percentage yield?
Answer:
C
Explanation:
Visible light has an average wavelength of 550 nm. How much energy would be in this wavelength of light? 5 x 10-19
Answer:
E = 3.6×10⁻¹⁹ J
Explanation:
Given data:
Wavelength = 550 nm (550 ×10⁻⁹ nm)
Energy of wave = ?
Solution:
Formula:
E = h c/λ
c = 3×10⁸ m/s
h = 6.63×10⁻³⁴ Js
Now we will put the values in formula.
E = 6.63×10⁻³⁴ Js × 3×10⁸ m/s /550 ×10⁻⁹ nm
E = 19.89×10⁻²⁶ J.m /550 ×10⁻⁹ nm
E = 0.036×10⁻¹⁷ J
E = 3.6×10⁻¹⁹ J
What mass of a solution labeled 6.3% sucrose (C12H22O11, 342 g/mol) by mass contains 11.0 g of sucrose?
Answer:
174.6g of solution contains the 11.0g of sucrose
Explanation:
A solution of 6.3% by mass of sucrose contains 6.3g of sucrose in 100g of solution, that is, 6.3g of sucrose / 100g of solution.
As we want to find the mass contains 11.0g of sucrose, we can write:
11.0g of sucrose * (100g of solution / 6.3g of solution) =
174.6g of solution contains the 11.0g of sucroseHow to remove filter of the text
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Consider the following equations: 3A + 6B â 3D ÎH = â418 kJ E + 2F â A ÎH = â118.2 kJ C â E + 3D ÎH = â60.8 kJ Suppose the first equation is reversed and multiplied by 1/6, the second and third equations are divided by 2, and the three adjusted equations are added. What is the net reaction and what is the overall heat of this reaction?
Answer:
The net reaction is:
1/2 C + F + → A + B D
The overall heat of this reaction = 40.96 kJ
Explanation:
Given that:
3A + 6B → 3D ΔH = -418 kJ
E + 2F → A ΔH = -118.2 kJ
C → E + 3D ΔH = 60.8 kJ
The first process says we should reverse the first equation and multiply it by 1/6
i.e.
3D × 1/6 → 3A × 1/6 + 6B × 1/6 ; ΔH = +1/6 × 418 kJ
1/2D → 1/2 A + B ; ΔH = 69.66 kJ
Then the second and the third equation are divided by 2
1/2 × E + F → 1/2 A ; ΔH = -1/2 × 118.2 kJ
1/2C → 1/2 E + 3/2 D ; ΔH = 1/2 × 60.8 kJ
By adjusting the three equations together; we have:
1/2D → 1/2 A + B ; ΔH = 69.66 kJ
1/2 × E + F → 1/2 A ; ΔH = -59.1 kJ
1/2C → 1/2 E + 3/2 D ; ΔH = 30.4 kJ
1/2C + F → A + B + D ; ΔH = (69.66 - 59.1 + 30.4) kJ
ΔH = 40.96 kJ
The net reaction is:
1/2 C + F + → A + B D
The overall heat of this reaction = 40.96 kJ
Ammonia (NH3) is the active cleaning ingredient in Windex and is also the main contributor to the odor of stale cat urine. Ammonia has a ΔH°vap of 23.35 kJ/mol and a ΔS°vap of 97.43 J/mol·K. What is the normal boiling point of ammonia
Answer:
[tex]T_b=239.7K=-33.49\°C[/tex]
Explanation:
Hello!
In this case, since the relationship between entropy and enthalpy for any process is defined below:
[tex]S=\frac{H}{T}[/tex]
For the vaporization of ammonia or any liquid, we can write:
[tex]\Delta S_{vap}=\frac{\Delta H_{vap}}{T_{vap}}[/tex]
In such a way, solving the temperature of vaporization, or boiling point, we have:
[tex]T_{vap}=\frac{\Delta H_{vap}}{\Delta S_{vap}}[/tex]
Plugging in the given enthalpy and entropy of vaporization we obtain:
[tex]T_{vap}=T_b=\frac{23350\frac{J}{mol} }{97.43\frac{J}{mol*K}} \\\\T_b=239.7K=-33.49\°C[/tex]
Best regards!
From the information provided in the question, the boiling point of ammonia is 240 K.
Entropy is the degree of disorderliness in a system. The entropy of a system can be obtained using the relation;
ΔS°vap = ΔH°vap /T
Now;
ΔH°vap = 23.35 kJ/mol
ΔS°vap = 97.43 J/mol·K
T = ?
Making T the subject of the formula and substituting values;
T = ΔH°vap /ΔS°vap
T = 23.35 × 10^3J/mol/97.43 J/mol·K
T = 240 K
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How do the chemical reactions in this lab activity compare to nuclear reactions, such as fission and fusion?
The chemical reaction has been the low energy reaction containing electrons rearrangement, while nuclear reactions have been the higher energy reactions with change in nuclei.
What are nuclear reactions ?The term nuclear reactions is defined as when there has been the including the change in the nuclei of the atom. However, the reaction has been known as the chemical reaction when the change has been processed in the electrons with the rearrangement.
The nuclear reactions have made up of a more amount of energy to be liberated, while the amount of energy included in the chemical reaction has been smaller.
Thus, the chemical reaction has been the low energy reaction including electrons rearrangement, while nuclear reactions have been the high energy reactions with change in nuclei.
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Suppose 0.363 g of barium acetate is dissolved in 100. mL of a 25.0 m M aqueous solution of ammonium sulfate. Calculate the final molarity of barium cation in the solution. You can assume the volume of the solution doesn't change when the barium acetate is dissolved in it. Be sure your answer has the correct number of significant digits.
Answer:
Molarity of Ba²⁺ is 0M
Explanation:
Some barium ion, Ba²⁺ is produced when barium acetate is dissolved (Moles of barium acetate = moles of Ba²⁺ in solution). Then, Ba²⁺ reacts with sulfate ion to produce BaSO₄, an insoluble salt. The concentration of Ba²⁺ is the initial concentration - the concentration of SO₄²⁻ in solution.
Initial moles of Ba²⁺:
Moles barium acetate (Molar mass: 255.43g/mol)
0.363g * (1mol / 255.43) = 1.421x10⁻³ moles of Ba²⁺
Moles SO₄²⁻ = Moles of ammonium sulfate:
100mL = 0.100L * (0.025mol / L) = 2.5x10⁻³ moles of SO₄²⁻.
As moles of SO₄²⁻ are higher than moles of Ba²⁺, Molarity of Ba²⁺ is 0M because all moles of Ba²⁺ reacts producing BaSO₄(s), an insoluble salt.
what looks attractive on guys
Answer: for me everything ig
Explanation:
It is possible for gases in the atmosphere to change the behavior of energy on earth. Agree or disagree
Answer:
I agree
Explanation:
because the sunlight passes through the atmosphere and is absorbed by earth's surface.
The green house gases in the atmosphere can change the behavior of energy on earth. Thus i agree with this statement.
What is green house effect?The green house effect is defined as a process by which the radiations from the sun are absorbed by the green house gases like methane, Chloro fluoro carbons and not reflected back into the space. This makes the surface as insulator and prevents it from freezing.
Due to the increased level of green house gases, the temperature of the earth increases considerably and thereby causes global warming, depletion of ozone layer, smog and air pollution, etc.
It is the natural green house effect which affect the behaviour of heat energy radiated by the sun. The green house gases never let the radiations escape from the earth and increase the surface temperature of earth. This leads to global warming.
Thus green house gases affects the solar energy.
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Which two types of energy are formed by the transformation shown in the
photo?
A. Chemical energy →
thermal energy
n BiThermal energy
electrical energy
C. Thermal energy – chemical energy
D. Chemical energy - electromagnetic energy
SUBMIT
Answer:
A. Chemical Energy --> Thermal Energy
D. Chemical Energy --> Electromagnetic Energy
Explanation:
I took the quiz!
Which statement describes how phase changes
can be diagrammed as a substance is heated?
The phase is on the y-axis and thew
temperature is on the x-axis.
The temperature is on the y-axis and the
phase is on the x-axis.
The time is on the y-axis and the temperature
is on the x-axis.
The temperature is on the y-axis and the time
is on the x-axis
Answer: D
Explanation:
On edge
Answer:
D
Explanation:
just did it on Ed
what is the atomic number of oxygen
Answer: The atomic number of oxygen is "O" .
Explanation:
Because Oxygen is the chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds.
A solution of hydrochloric acid of unknown concentration was titrated with 0.16 M NaOH. If a 350-mL sample of the HCl solution required exactly 17 mL of the NaOH solution to reach the equivalence point, what was the pH of the HCl solution?
Answer:
The correct answer is 2.1
Explanation:
The neutralization reaction involved in the titration is between a strong acid (HCl) and a strong base (NaOH), as follows:
HCl + NaOH → NaCl + H₂O
According to this, 1 equivalent of HCl reacts with 1 equivalent of NaOH. The equivalence point is the point at which the amount of NaOH added reacted completely with the amount of HCl.
moles of acid = moles of base
moles HCl = moles NaOH
Ca x Va = Cb x Vb
Ca = (Cb x Vb)/Va = (0.16 M x 17 mL)/(350 mL) = 7.8 x 10⁻³ M
Since HCl is a strong acid, we calculate the pH of the solution directly from the concentration of acid:
[H⁺]= Ca = 7.8 x 10⁻³ M
pH = -log [H⁺] = -log (7.8 x 10⁻³ M) = 2.11
Therefore, the pH of the HCl solution is 2.1